📊 Physics
Q. What is radioactivity?
  • (A) Emission of light from hot objects
  • (B) Spontaneous emission of particles from unstable nuclei
  • (C) Absorption of radiation by atoms
  • (D) Production of energy by friction
✅ Correct Answer: (B) Spontaneous emission of particles from unstable nuclei

Explanation: Radioactivity is the spontaneous disintegration of unstable atomic nuclei with emission of radiation.

Explanation by: Tina Singh
Radioactivity is the spontaneous disintegration of unstable atomic nuclei with emission of radiation.

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